Infection Prevention and STI Control Flashcards

Question 1

What is the difference between infection and colonization?

Accepted Answer

Infection occurs when a microorganism invades body tissues and causes harm or an immune response. Colonization means a microorganism is present and multiplying on a body surface or within a site without causing disease or clinical signs. Recognizing this difference matters because colonized people may still transmit organisms to others, so precautions matter.

Question 2

What is a pathogen, and how does it differ from a commensal organism?

Accepted Answer

A pathogen is a microorganism capable of causing disease in a host. A commensal organism lives on or within a host, usually without harming it, and may even provide benefits such as helping maintain normal skin or gut function. Some commensals can cause infection in unusual locations.

Question 3

What is a reservoir in the context of infectious disease transmission?

Accepted Answer

A reservoir is the place where an infectious agent normally lives and multiplies, such as a human, an animal, or the environment. Some pathogens persist in soil or water. Identifying the reservoir helps public health teams decide where control measures should focus, because interrupting transmission from that source prevents further spread.

Question 4

What is the difference between a vector and a vehicle in transmission?

Accepted Answer

A vector is a living organism, often an insect or tick, that carries a pathogen from one host to another. A vehicle is a nonliving object or substance, such as contaminated food, water, or equipment, that transmits an agent without being alive. Both terms help investigators classify routes and plan prevention.

Question 5

What does the term healthcare-associated infection describe, and why is it tracked?

Accepted Answer

A healthcare-associated infection is an infection a patient acquires during care in a facility, such as a hospital or clinic, that was not present or incubating when care began. Facilities track these infections as a quality indicator, since they reveal gaps in practice and allow teams to compare performance and target improvements.

Question 6

What does standard precautions mean in infection prevention?

Accepted Answer

Standard precautions are a set of baseline practices applied to all patients and all body substances, regardless of their presumed infection status. They include hand hygiene, use of personal protective equipment when exposure is expected, safe handling of sharps, respiratory hygiene, and proper cleaning of equipment and the environment.

Question 7

What is the incubation period, and why does it matter for control?

Accepted Answer

The incubation period is the interval between exposure to an infectious agent and the first appearance of signs or symptoms. It matters for control because people can sometimes transmit organisms before they feel ill, which affects when contacts should be identified, monitored, or isolated.

Question 8

What is the meaning of the term fomite?

Accepted Answer

A fomite is an object or surface that can carry infectious agents and transfer them to a person through contact. Examples include doorknobs, countertops, medical equipment, and shared devices. Because fomites are often overlooked, cleaning schedules and labeling practices pay close attention to frequently touched items.

Question 9

What are the six links in the chain of infection?

Accepted Answer

The six links are the infectious agent, the reservoir, the portal of exit, the mode of transmission, the portal of entry, and the susceptible host. Each link must be present for an infection to spread. Breaking any single link interrupts the chain, which is why prevention strategies target different points along it.

Question 10

What is a portal of exit, and can you give an example?

Accepted Answer

A portal of exit is the route by which an infectious agent leaves its reservoir, such as respiratory secretions, blood, urine, or other body fluids. Leaving the host is a necessary step before an organism can reach someone new. Recognizing exit routes helps staff decide which personal protective equipment and hygiene measures protect others.

Question 11

What is the difference between direct and indirect transmission?

Accepted Answer

Direct transmission occurs when an agent passes straight from one person to another through contact, such as touching or droplet exposure. Indirect transmission involves an intermediate step, such as a contaminated object, a shared surface, or a vector. Both routes need prevention, but indirect routes depend heavily on cleaning practices.

Question 12

How do droplet and airborne transmission differ in terms of distance and particle behavior?

Accepted Answer

Droplet transmission involves relatively large respiratory particles that travel short distances before settling. Airborne transmission involves smaller particles that remain suspended in the air and can spread over longer distances within a room or building. The difference shapes the choice of room, mask, and ventilation controls used in facilities.

Question 13

How does environmental contamination contribute to healthcare transmission?

Accepted Answer

Environmental contamination occurs when pathogens persist on surfaces, equipment, or water sources and are later picked up by hands or objects. Surfaces touched frequently, such as bed rails, keyboards, and call buttons, can serve as reservoirs for transfer. Effective control therefore combines routine cleaning, disinfection of high-touch areas, and hand hygiene after contact.

Question 14

What is the role of the susceptible host in the chain of infection?

Accepted Answer

The susceptible host is the person who can become infected when an agent reaches them, because immunity is low or a portal of entry is available. Host factors include age, chronic conditions, immune status, nutritional status, and the integrity of skin and mucous membranes. Protecting susceptible hosts is a core goal of infection prevention.

Question 15

What is a mode of transmission, and how does it relate to a portal of entry?

Accepted Answer

A mode of transmission is the method by which an agent moves from its source to a new host, such as contact, droplet, airborne, or vehicle routes. The portal of entry is the body opening or break in tissue where the agent gets in, such as the nose, mouth, or a wound.

Question 16

Why can healthcare workers sometimes carry organisms without becoming ill?

Accepted Answer

Healthcare workers can carry organisms on their hands, clothing, or equipment without developing symptoms, which makes them possible links in a chain. This is why staff members are trained to clean their hands and follow precautions even when they feel well. Prevention therefore cannot depend only on spotting ill people.

Question 17

When is hand hygiene typically required in a healthcare setting?

Accepted Answer

Hand hygiene is required before patient contact, before clean or aseptic tasks, after body fluid exposure risk, after patient contact, and after contact with the patient's surroundings. These moments are commonly grouped into five opportunities. Staff should perform hand hygiene at each point where contamination could move from one site to another.

Question 18

What is the difference between handwashing with soap and water and alcohol-based hand rub?

Accepted Answer

Handwashing with soap and water physically removes dirt, debris, and many microorganisms, and it is the required choice when hands are visibly soiled. Alcohol-based hand rub is a fast, effective option when hands are not visibly soiled, and it requires no sink. Both methods are core parts of hand hygiene.

Question 19

What does donning and doffing personal protective equipment mean?

Accepted Answer

Donning means putting on personal protective equipment correctly before entering an area or beginning a task, while doffing means removing it in a sequence that avoids contaminating yourself. Both steps follow an ordered sequence set by facility policy. Doffing carries contamination risk if handled carelessly.

Question 20

Which types of personal protective equipment are commonly used in healthcare?

Accepted Answer

Common personal protective equipment includes gloves, gowns, face masks, respirators, eye protection such as goggles or face shields, and head or shoe covers. Selection depends on the anticipated exposure, such as contact with body fluids, splashes, or airborne particles. Each item protects a specific route of exposure, so no single item covers every risk.

Question 21

Why must hand hygiene be performed after removing gloves?

Accepted Answer

Gloves reduce contamination of hands but are not a substitute for hand hygiene, because they can develop tears or microscopic defects, and hands can become contaminated during removal. Performing hand hygiene after removal removes any residual organisms and prevents carrying them to the next surface or person.

Question 22

What is the purpose of a surgical mask compared with a respirator?

Accepted Answer

A surgical mask is a loose-fitting barrier that protects against splashes and sprays and limits droplets the wearer releases. A respirator is a tight-fitting device designed to filter very small airborne particles. Respirators require fit testing and training, while surgical masks generally do not, so selection follows facility policy.

Question 23

How should a healthcare worker handle a gown that becomes visibly soiled?

Accepted Answer

A visibly soiled gown should be removed promptly as part of the donning and doffing sequence, avoiding contact between the outer surface and bare skin or uniform. The worker then performs hand hygiene and puts on a clean gown if the task requires it. Facility policy defines the exact steps.

Question 24

Why is wearing jewelry on the hands discouraged during patient care?

Accepted Answer

Rings, bracelets, and watches can trap microorganisms and make thorough hand cleaning harder, especially under the edges of jewelry where soap and rub may not reach. Many facilities therefore ask staff to remove rings and wristwatches and keep nails short and clean, which supports effective hand hygiene.

Question 25

What is the difference between sterilization and disinfection?

Accepted Answer

Sterilization is a process that eliminates all forms of microbial life, including bacterial spores, on an item. Disinfection reduces the number of microorganisms on a surface or object to a safer level but does not necessarily destroy every organism, especially spores. Choosing between them depends on how the item will be used.

Question 26

What is the Spaulding classification, and why is it used?

Accepted Answer

The Spaulding classification sorts medical items into critical, semicritical, and noncritical categories based on the risk of infection associated with their use. Critical items enter sterile tissue or the vascular system and need sterilization. Semicritical items touch mucous membranes or nonintact skin and need at least high-level disinfection, while noncritical items touch only intact skin.

Question 27

What does the term high-level disinfection mean compared with low-level disinfection?

Accepted Answer

High-level disinfection destroys nearly all microorganisms and suits semicritical items that contact mucous membranes. Low-level disinfection kills many vegetative bacteria and some viruses but is not effective against spores, so it suits noncritical surfaces. Each level is chosen by item risk and the product's labeled instructions.

Question 28

Why must instruments be cleaned before they are sterilized or disinfected?

Accepted Answer

Visible soil, blood, and organic material can shield microorganisms from heat, chemicals, and sterilants, so cleaning must come first. Cleaning physically removes debris and reduces the microbial load before any disinfection or sterilization begins. Many facilities therefore treat cleaning as a separate, verified step in reprocessing.

Question 29

What is an autoclave, and what does it use to achieve sterilization?

Accepted Answer

An autoclave is a pressurized chamber that sterilizes items using steam at a controlled temperature and pressure for a set period. Steam under pressure transfers heat efficiently and destroys microorganisms, including spores, when conditions are correct. Facilities verify autoclave performance with routine monitoring and keep records of every cycle.

Question 30

Why are sterile supplies stored with protective packaging and expiration controls?

Accepted Answer

Sterile packaging maintains a barrier that keeps an item sterile until the moment of use, so damage, moisture, or an opened seal can compromise it. Storage areas are kept clean, dry, and organized, and packages are inspected before use. Dating helps staff confirm that a sterile item is still within its validated storage period.

Question 31

What is environmental cleaning, and how is it prioritized?

Accepted Answer

Environmental cleaning is the routine removal of dirt, dust, and microorganisms from surfaces and equipment in a facility. Priority is usually given to high-touch surfaces, such as bed rails, doorknobs, and shared devices, because they are handled by many people. Schedules, product instructions, and training determine how well this work protects people.

Question 32

Why is a single-use item discarded rather than reprocessed?

Accepted Answer

A single-use item is designed and labeled for one patient or one use only, and reprocessing could damage it or leave it less reliable. Reusing it would also raise questions about whether cleaning and sterilization are adequate for its design. Following the manufacturer's labeling and facility policy is the basis for these decisions.

Question 33

What does the term sexually transmitted infection describe, and how does it differ from a disease?

Accepted Answer

A sexually transmitted infection is an infection spread mainly through sexual contact, including vaginal, anal, and oral sex. An infection refers to the presence of an organism in the body, while a disease refers to the clinical illness that may or may not result. Many infections cause no symptoms, which is why screening matters.

Question 34

What is the purpose of partner notification in STI control?

Accepted Answer

Partner notification informs people who may have been exposed to an infection so they can seek testing and, where appropriate, care. It is usually offered confidentially, and it interrupts onward transmission by reaching people who might otherwise spread an infection without knowing it. Programs respect privacy and voluntary participation.

Question 35

Why is confidentiality central to STI screening programs?

Accepted Answer

Confidentiality encourages people to seek testing, share accurate information, and return for follow-up without fear of stigma, discrimination, or unwanted disclosure. Without trust, people may avoid services, which reduces case finding and weakens public health data. Protecting records through access controls and minimum necessary disclosure supports both individual rights and program goals.

Question 36

What is a surveillance system, and why does it matter for infection control?

Accepted Answer

A surveillance system is the ongoing, systematic collection, analysis, and sharing of health data to detect and monitor disease patterns. It matters for infection control because it reveals trends, clusters, and unusual events that may signal an outbreak or a gap in practice. Findings guide where prevention resources should go.

Question 37

What is a case definition, and why do public health teams use one?

Accepted Answer

A case definition is a standard set of criteria, such as clinical features, laboratory results, and time and place, used to decide whether a person counts as a case. Teams use it so that data are consistent across clinics, regions, and reporting periods. Consistent definitions make trends comparable and reduce confusion.

Question 38

What is the difference between incidence and prevalence?

Accepted Answer

Incidence counts new cases that develop during a defined period in a population, while prevalence counts all existing cases at a given point or over a period. Incidence shows the rate of new spread, which is useful for judging transmission. Prevalence shows the overall burden on a community and helps plan services.

Question 39

How do condoms reduce the risk of sexually transmitted infection?

Accepted Answer

Male and female condoms act as a physical barrier that reduces contact with infected fluids and skin during sexual activity. Consistent and correct use lowers risk for many infections, though no method removes risk completely, especially for infections spread through skin contact. Condoms work best alongside screening and honest communication.

Question 40

How does routine screening contribute to STI control in a community?

Accepted Answer

Routine screening finds infections that may cause no symptoms, allowing people to receive timely care and reducing the chance they unknowingly pass infection to others. Screening programs also collect data that helps public health teams see where infections are concentrated. Targeted screening focuses resources on groups with higher risk.

Infection Prevention and STI Control Flashcards

1Core Terminology and Definitions

2Chain of Infection and Transmission

3Hand Hygiene and Protective Equipment

4Sterilization, Disinfection and Cleaning

5STI Prevention and Public Health Control

Learning Resources